M1.8 earthquake 24 km SSE of Mammoth, Wyoming

A magnitude 1.8 earthquake struck 24 km SSE of Mammoth, Wyoming on Mon, Oct 4, 2021, 3:33 PM MDT (21:33 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M2.6 25 km SSE of Mammoth, Wyoming. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Distance and direction from each place to the epicenter, with its forecast.

Within 100 km, magnitude 1.5 and up: 56 in the 60 days after this one and 34 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event uu60461422. Read Sun, Oct 4, 2026, 6:52 PM UTC.